Honeywell SC Series - Chapter 3 Operating Modes; 3.1 Operating Modes; 3.3 RUN Mode Operation

6 Honeywell Sensing and Control
Signal Conditioning, Self Calibrating Digital Indicators
Rev. G, 008-0608-00
Chapter 3 Operating Modes
3.1 Operating Modes
The SC Series instruments have four modes of operation:
• INITIALIZE,totesttheinstrumentuponpowerup
• RUN,normaloperation
• ERROR,whichindicatesthatanabnormalsituationhasoc-
curred that stopped the operation of the instrument
• SETUP,amenuwhichallowssetupandcalibrationofthe
chassis and its channels
Each of these will be described in this chapter.
3.2 INITIALIZE Mode
When the instrument is powered up or otherwise reset, it enters
the INITIALIZE mode. As the instrument enters this mode, all seg-
ments of the display and all front panel indicator lights (if avail-
able) illuminate momentarily. Next, each channel in the instrument
is checked for proper operation.
If a problem is detected, the instrument may enter the ERROR
mode.
Depending on the type of channel, other actions may occur. For
example, a Strain-Gage channel will calibrate its analog-to-digital
converter and attempt to read the transducer’s Signature Calibra-
tion information. If the transducer is equipped with Signature Cali-
bration, the transducer’s serial number is displayed momentarily.
3.3 RUN Mode
After the INITIALIZE mode finishes, the instrument enters the
RUN mode, its normal mode of operation.
3.3.1 Display
Model SC3004 and upper line of SC2000,
SC2001
The display will show a channel number on the far left, followed
by the channel’s operation messages.
For example, a Strain Gage amplifier channel will use the format
below:
1p 00000. PSIG ¸
where:
• Channel number: “1” is the channel number.
• Value type: The next character indicates the nature of the
following value. A blank character indicates the tracking
value. The instrument is “tracking” the signal, continuously
updating the display in response to the signal from the trans-
ducer.
A “p” character indicates the peak value (highest value
seen since the [CLEAR] button was last pressed).
A “q” character indicates the valley value (lowest value seen
since the [CLEAR] button was last pressed).
• Data value: “00000.” displays the value from the transducer
in engineering units.
• Units label: “PSIG” indicates the engineering units being
used (up to 4 characters).
• Tare indicator: A “¸“ symbol indicates tare is off; a “®“ sym-
bol indicates tare is on.
Lower Line of SC2000, SC2001
The contents of the display’s lower line is selected with the
“DISPLAY MENU -> LOWER MODE” menu item as either displaying a
channel or indicating the status of Limits. See “Indicator Lights”
on page 21.
3.3.2 [VALUE] button
After the channel number, the next characters indicate which
data value for the displayed channel is shown. There are three
(possibly four) data values available from each channel:
(blank), tracking data value
• “p”, peak data value, (highest value since the peak/valley
detector was cleared)
• “q”, valley data value, (lowest value since the peak/valley
detector was cleared)
• “0”, percentage of the Analog-to-Digital converter’s full-scale
digitizing capability. This data value is only available when
the channel’s “DIAGNOSTICS->DISPLAY ADC” menu item is set to
“ON”.
Pressing and releasing the [VALUE] button cycles though the
available sources for data values for the displayed channel.